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#31
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My head porter is one of those he's dissected. He does work for Mondello Racing. If you're not sure who Joe Mondello is, you might want to look him up. Marty is pretty good with the Magnum motors, but I would hardly take it to "Guru" status. His philosophy on heads is his own, but certainly not universally accepted. To keep the thread on topic, just produce for us a flow chart that shows the low lift flow numbers that he refers to on his page and I'll be happy to post mine. Then you can talk apples to apples. He says not to get too hung up on absolute high lift numbers, then posts only the 265 cfm @25" figure(for the ported 2.02 R/T) without specifying the lift and offering no further info about the curve. A little inconsistent with the info, IMO. |
#32
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Here we go again
The 265-270 cfm is max lift flow. You'll find that far more important #s are the low lift and mid lift flows, and actual area under the flow curve. You can get a detailed explanation on pages 140-141 in Mopar Magnum engines 2nd edition. Peak #s mean didily unless your cam lobes are square!!! Salarguy |
#33
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So let me ask this question. I, by no means have anything close to a stock motor. Was it worth my while to have my 2.02 heads ported and polished and gasket matched? Should I have left my heads alone? Should I have kept mt 1.92's? I do plan on putting on a blower and trying to make 550-600hp out of this mill. I have a race/street motor and yes it is a high revver. Did I do justice to my motor or did I defeat my purpose? 408ci stroker; 4.03" bore, 4" stroke, intake/exhaust ported, M1 intake gasket matched, gasket matched heads, all forged internal parts.
I have been told that opening up the heads adds in low end power and helps the flow and power on the top as well. Is that wrong for my application? Inquiring minds want to know. |
#34
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Could someone explain this REVERSION thing??? Anyone can say its bad, but why is it bad?
TJ |
#35
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Have you got any flow charts or links to some that show his work? |
#36
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#37
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I did have a Level10 transmission rebuild kit put in it along with a Trans-Go shift kit just for kicks. I'm waiting to find a 9-1/4 rear and stuff it full of goodies. I may just find a wrecked R/T or a Durango and take that rear. I have been informed that the Level10 kit(red or purple clutches) is good up to 550-575hp and as long as I don't start getting any traction in the rear I'm okay. Eventually the whole rear end has got to go. Now the transmission, I have to look into that one a little more. I'm not really that hard on it now anyway. That one tire spin stuff gets old and I really can't race any real fast cars because all I would do is spin the wheel(s). If I had a limited slip rear(8-3/4 or 9-1/4), 4.10's and a little bit better tuning on my computer, I would race a lot of cars and I would win most of them. I think that this thing is good for high 13's or low 14's, but for now my best is 15.7@89mph with a 2.4 sec 60' time. |
#38
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Cliff Foster, do you still have the R/T heads for sale?
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#39
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TJ318
You deserve an answer, you've been patient. Moderate reversion is hot---- hogging out exhaust ports on R/T heads to match your headers----not. Extrudehoning is hot---- making your runners look like a mirror---not. I really need to end here 'cause I tried to answer Sheffy the guy with the mild street motor, who wanted butt dyno, and along came King Kong S/C, stroker guys looking for another clone! Later, Salarguy |
#40
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Well, I still have them, but I have a fella in Indiana that's got his eye on them and he's sending me a check in the mail. Don't have it yet though. I do still have a full set of .20 overbore(4.02) 10:1 pistons/rods from a magnum380 that have rods from the regular stroke crank. when I get the check from the guy in Indiana I'll unpost that the heads are for sale. They are currently going for $450.00 complete(valves,springs,rocker arms) with mild headwork. If I don't get the check by the end of the week I will call him and make sure if he still wants them. If not, they are back on the block.
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#41
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I was simply asking for some numbers to support yours and Marty's claims. I've got mine at the ready for comparison. |
#42
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If Marty and for that matter Hughes are protecting their numbers now.I wouldn't be a very nice person if I announced them. It's obviously a competition issue, combined with some pirating and one upmanship. I only have one set of numbers at my disposal and they wouldn't interest you. They are only meager street port, and may have been improved upon by now. They are three year old #s.
Salarguy |
#43
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Cliff Foster, if you don't get the money let me know, I'll take them off of your hands! Thanks!
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#44
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You got it. What about the slugs(pistons)? Did you think about those? How much boost are you running and where did you get your magnecore wires? I have a set now, but it's for when I have to replace them. My email is fittrainer@msn.com |
#45
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ROFL There is no mysterious Corporate secret to flow numbers and curves. It's what you did to get there that matters and what you might want to conseal. What's a guy gonna do, plagerize your chart? Here's a guy more than willing to show what he can do. I believe Marty is familiar with him: http://www.thefastman.com/thefastman...e=PortedHeads. BTW, if you've got flow numbers on R/T heads(the topic at hand) that are 3 years old, you're probably the only one on the planet since they weren't even on the market back then. |
#46
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Well I've got to admit I have never seen those #'s from any set of worked stockers as a matter of fact I have seen mildly ported 2.02's that didn't achieve those #'s.. My experience has been 220-230 maxed out the stockers.. Also have observed that the stockers have a tendency to stall at anything much over .500-.512 lift.. Barry |
#47
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was just aboput to mention Dan arcand... anyways here is an older folow chart of his work on a stock head
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#48
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Thanks for posting the chart.. That is exceptional #'s for stockers even when taken out to 2.02's.. Would you by chance have any idea what that port job cost?? Not wanting one just curious how much work it took to get there..
Barry |
#49
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Well, I don't want to be left out of the party, so at the risk of having trade secrets "stolen", here are some R/T numbers from the same head porter. Note the low lift numbers and compare them to dodgeboys Magnum numbers. If anyone wants to post competitors numbers, feel free. We might actually learn something.
http://users.rcn.com/bobm.dnai/images/rtheads-chart.jpg |
#50
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now those look like more what I'm used to seeing out of R/T heads.. also can tell the diff under the curve..
Barry |
#51
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Barry, Dan really doesnt market the heads so you would have to contact him personally on the price
As far as his r/t heads are concerned, I think he is getting even better numbers last time I talked to him, that flow bench graph for the 2.02 heads is from last March. |
#52
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#53
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That is the full compliment; intakes, exhausts and bowl work.
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#54
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Magnum R/T 7140 Heads Wanted
im looking for a set of Magnum R/T Heads to run on our NASCAR modified type car. rules specify the P5007140 with 1.92 and 1.625 valves. no port work is allowed they have to be stock for our division. thought I might get lucky on a forum chat such as this.
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#55
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well i found a set brand new we bought. Magnum R/T 7140 heads with a MP P5007381 2 brrl intake that is obsolete for our rules. only took me almost 2yrs to find this package. now ill sell it.
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#56
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This thread is 15 years old.
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#57
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yeah thats why i revitalized it and how i even found these parts to begin with. old threads are good
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